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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (2,044) $ (93)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 82 111
Stock-based compensation 134 115
Accrued interest 112 110
Other (7) (7)
Changes in assets and liabilities:    
Accounts receivable 574 267
Inventories (48) 547
Prepaid expenses and other assets 221 (21)
Accounts payable (170) (148)
Deferred revenue and other liabilities (19) (490)
Net cash provided by (used in) operating activities (1,165) 391
Cash flows from investing activities:    
Purchases of property and equipment (12) (55)
Proceeds from maturities of short-term investments 300 500
Purchases of short-term investments   (1,567)
Net cash provided by (used in) investing activities 288 (1,122)
Cash flows from financing activities:    
Proceeds from sale of common stock, net of financing costs 1,619  
Net proceeds from exercise of pre-funded warrants 2  
Taxes paid to net share settle equity awards (1) (1)
Net cash provided by (used in) financing activities 2,199 (1)
Net increase (decrease) in cash and cash equivalents 1,322 (732)
Cash and cash equivalents at beginning of period 6,053 7,104
Cash and cash equivalents at end of period 7,375 6,372
Supplemental disclosure:    
Issuance of convertible note in settlement of accrued interest 112 $ 78
Fair value of warrant exercise price adjustment considered as deemed dividend 392  
PPP Note    
Cash flows from financing activities:    
Proceeds from PPP note $ 579