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Effects of Adopting ASU Topic 606, Balance Sheet Highlights (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current liabilities [Abstract]    
Deferred revenue, current portion $ 0 $ 1,500
Total current liabilities 3,584 4,482
Deferred revenue, non-current portion 0 1,000
Other liabilities 140 140
Total liabilities 3,724 5,622
Accumulated deficit (187,070) (175,516)
Total stockholders' equity 3,647 1,553
Pre-Topic 606 [Member]    
Current liabilities [Abstract]    
Deferred revenue, current portion 1,500  
Total current liabilities 5,084  
Deferred revenue, non-current portion 250  
Other liabilities 140  
Total liabilities 5,474  
Accumulated deficit (188,820)  
Total stockholders' equity 1,897  
Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member]    
Current liabilities [Abstract]    
Deferred revenue, current portion (1,500) (1,500)
Total current liabilities (1,500) (1,500)
Deferred revenue, non-current portion (250) (1,000)
Other liabilities 0 0
Total liabilities (1,750) (2,500)
Accumulated deficit 1,750 2,500
Total stockholders' equity $ 1,750 2,500
Post-Topic 606 [Member]    
Current liabilities [Abstract]    
Deferred revenue, current portion   0
Total current liabilities   2,982
Deferred revenue, non-current portion   0
Other liabilities   140
Total liabilities   3,122
Accumulated deficit   (173,016)
Total stockholders' equity   $ 4,053