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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenues:    
Revenues $ 3,671 $ 2,689
Cost of product revenues $ 1,148 $ 1,318
Type of Cost, Good or Service [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Amortization of intangible assets $ 1,225 $ 1,225
Gross profit 1,298 146
Development revenues:    
Government contracts and other 2,983 3,722
Total development revenues 2,983 3,722
Operating expenses:    
Research and development 8,622 11,678
Sales and marketing 2,018 3,593
General and administrative 6,339 7,594
In process research and development acquired from Azaya 0 1,686
Total operating expenses 16,979 24,551
Operating loss (12,698) (20,683)
Other income (expense):    
Interest income 43 33
Interest expense (1,922) (2,049)
Other income, net 180 13
Change in fair value of warrants 2,233 0
Issuance cost of warrants (470) 0
Total other expense 64 (2,003)
Net loss (12,634) (22,686)
Beneficial conversion feature for convertible preferred stock (2,487) (3,977)
Net loss allocable to common stockholders $ (15,121) $ (26,663)
Basic and diluted net loss per share allocable to common stockholders $ (1.74) $ (8.23)
Basic and diluted weighted average shares used in calculating net loss per share allocable to common stockholders 8,692,551 3,238,983
Comprehensive loss:    
Net loss $ (12,634) $ (22,686)
Other comprehensive income – foreign currency translation adjustments (169) 129
Comprehensive loss (12,803) (22,557)
Product [Member]    
Revenues:    
Revenues 2,671 2,689
License [Member]    
Revenues:    
Revenues $ 1,000 $ 0