Annual report pursuant to Section 13 and 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 ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Revenue $ 18,517,000 $ 15,288,000  
Cost of revenue 11,197,000 7,844,000  
Gross profit 7,320,000 7,444,000  
Loss from operations (44,965,000) (33,730,000)  
Comprehensive and net loss $ (49,981,000) $ (36,959,000)  
Basic and diluted (in dollars per share) $ (1.61) $ (2.11)  
Weighted average shares (in shares) 31,059,483 17,496,942  
Accrued liabilities $ 6,766,000 $ 4,605,000 $ 4,623,000
Other noncurrent liabilities 634,000 327,000 132,000
Accumulated deficit (155,385,000) $ (105,581,000) (105,404,000)
Accounting Standards Update 2014-09 [Member]      
Gross profit 749,000    
Accrued liabilities [1]     18,000
Other noncurrent liabilities [2]     (195,000)
Accumulated deficit [3]     $ 177,000
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenue 17,780,000    
Cost of revenue 11,209,000    
Gross profit 6,571,000    
Loss from operations (45,714,000)    
Comprehensive and net loss $ (50,730,000)    
Basic and diluted (in dollars per share) $ (1.63)    
Weighted average shares (in shares) 31,059,483    
Accrued liabilities $ 7,014,000    
Other noncurrent liabilities 1,313,000    
Accumulated deficit (156,311,000)    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue [4] 737,000    
Cost of revenue [5] (12,000)    
Gross profit [6] 749,000    
Loss from operations [6] 749,000    
Comprehensive and net loss [6] $ 749,000    
Basic and diluted (in dollars per share) [6] $ 0.02    
Weighted average shares (in shares)    
Accrued liabilities [7] $ (248,000)    
Other noncurrent liabilities [8] (679,000)    
Accumulated deficit [9] $ 926,000    
[1] Change relates to future costs associated with extended warranties required to be recorded on adoption of ASC 606.
[2] Change relates to long-term deferred revenue related to the extended warranties not required to be recorded under ASC 606.
[3] Change relates to cumulative effect adjustment upon adoption of ASC 606.
[4] Change relates to revenue from extended assurance warranties for which no deferral is required on the adoption of ASC 606.
[5] Change relates to the future costs associated with extended assurance warranties required to be recorded on the adoption of ASC 606.
[6] Change relates to the net gain adjustment on the adoption of ASC 606.
[7] 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.
[8] Change relates to noncurrent portion of deferred revenue in connection with the extended warranties not required to be recorded under ASC 606.
[9] Change relates to $177,000 cumulative effect adjustment on the adoption of ASC 606 and the net gain adjustment of $749,000 for the year ended December 31, 2018.