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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (1,405) $ 10
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 41 72
Stock-based compensation 68 (4)
Accrued interest 55 54
Other (3) (2)
Changes in assets and liabilities    
Accounts receivable 636 (549)
Inventories (137) 246
Prepaid expenses and other assets (35) (248)
Accounts payable (111) (21)
Deferred revenue and other liabilities 183 (284)
Net cash used in operating activities (708) (726)
Cash flows from investing activities:    
Purchases of property and equipment (6) (48)
Proceeds from maturities of short-term investments 300  
Purchases of short-term investments   (1,564)
Net cash provided by (used in) investing activities 294 (1,612)
Cash flows from financing activities:    
Exercise of pre-funded warrants 2  
Taxes paid to net share settle equity awards (1) (1)
Net cash provided by (used in) financing activities 1 (1)
Net decrease in cash and cash equivalents (413) (2,339)
Cash and cash equivalents at beginning of period 6,053 7,104
Cash and cash equivalents at end of period 5,640 4,765
Supplemental disclosure:    
Issuance of convertible notes in settlement of accrued interest $ 112 $ 78