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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income (loss) $ 348 $ (4,405)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 169 196
Stock-based compensation 94 185
Amortization of intangible assets 27 28
Amortization of debt issuance costs 12 11
Accrued interest 209 210
Changes in assets and liabilities:    
Accounts receivable 406 (151)
Inventories (134) 396
Prepaid expenses and other assets 93 173
Accounts payable 63 (219)
Deferred revenue and other liabilities (1,604) (602)
Net cash used in operating activities (317) (4,178)
Cash flows from investing activities:    
Proceeds from sales and maturities of marketable securities   2,364
Purchases of marketable securities   (1,602)
Net cash provided by investing activities   762
Cash flows from financing activities:    
Issuance costs for sale of common stock (12) (20)
Taxes paid to net share settle equity awards (38)  
Net cash used in financing activities (50) (20)
Net decrease in cash and cash equivalents (367) (3,436)
Cash and cash equivalents at beginning of period 3,868 8,766
Cash and cash equivalents at end of period 3,501 5,330
Supplemental disclosure:    
Issuance of convertible notes in settlement of accrued interest $ 463 $ 420