Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet and Consolidated Statements of Operations (Details)

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Note 2 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet and Consolidated Statements of Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
[1]
Revenue $ 5,525,000 $ 3,076,000 $ 9,224,000 $ 6,117,000    
Cost of revenue 2,711,000 1,837,000 5,063,000 3,456,000    
Gross profit 2,814,000 1,239,000 4,161,000 2,661,000    
Loss from operations (10,295,000) (9,063,000) (21,635,000) (15,479,000)    
Comprehensive and net loss $ (11,516,000) $ (10,425,000) $ (24,185,000) $ (17,120,000)    
Basic and diluted (in dollars per share) $ (0.37) $ (0.54) $ (0.85) $ (1.10)    
Accrued liabilities $ 5,258,000   $ 5,258,000   $ 4,623,000 $ 4,605,000
Other noncurrent liabilities 305,000   305,000   132,000 327,000
Accumulated deficit (129,589,000)   (129,589,000)   (105,404,000) $ (105,581,000)
Accounting Standards Update 2014-09 [Member]            
Gross profit     315,000      
Accrued liabilities [2]         18,000  
Other noncurrent liabilities [3]         (195,000)  
Accumulated deficit [4]         $ 177,000  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Revenue 5,405,000   8,894,000      
Cost of revenue 2,705,000   5,048,000      
Gross profit 2,700,000   3,846,000      
Loss from operations (10,409,000)   (21,950,000)      
Comprehensive and net loss $ (11,630,000)   $ (24,500,000)      
Basic and diluted (in dollars per share) $ (0.37)   $ (0.86)      
Accrued liabilities $ 5,302,000   $ 5,302,000      
Other noncurrent liabilities 753,000   753,000      
Accumulated deficit (130,081,000)   (130,081,000)      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Revenue 120,000 [5]   330,000      
Cost of revenue 6,000 [6]   15,000      
Gross profit 114,000 [7]   315,000      
Loss from operations 114,000 [7]   315,000      
Comprehensive and net loss $ 114,000 [7]   $ 315,000      
Basic and diluted (in dollars per share) [7]   $ 0.01      
Accrued liabilities [8] $ 44,000   $ 44,000      
Other noncurrent liabilities [9] 448,000   448,000      
Accumulated deficit [10] $ (492,000)   $ (492,000)      
[1] The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date.
[2] Change relates to future costs associated with extended warranties required to be recorded on adoption of ASC 606.
[3] Change relates to long-term deferred revenue related to the extended warranties not required to be recorded under ASC 606.
[4] Change relates to cumulative effect adjustment upon adoption of ASC 606.
[5] Change relates to revenue from extended assurance warranties for which no deferral is required on the adoption of ASC 606.
[6] Change relates to the future costs associated with extended assurance warranties required to be recorded on the adoption of ASC 606.
[7] Change relates to the net gain adjustment on the adoption of ASC 606.
[8] Change relates to future costs associated with extended warranties required to be recorded on the adoption of ASC 606, partially offset by the current portion of deferred revenue in connection with the extended warranties not required to be recorded under ASC 606.
[9] Change relates to noncurrent portion of deferred revenue in connection with the extended warranties not required to be recorded under ASC 606.
[10] Change relates to $177,000 cumulative effect adjustment on the adoption of ASC 606 and the net gain adjustment of $315,000 for the six months ended June 30, 2018.