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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net loss $ (2,580) $ (11,409) $ (10,668)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 185 598 747
Stock-based compensation 263 674 719
Amortization of intangible assets   111 112
Impairment of goodwill 420 12,856  
Amortization of debt issuance costs   30 45
Accrued interest 220 551 898
Gain on disposal of assets     (12)
Other (13)    
Changes in assets and liabilities      
Accounts receivable 447 289 (1,122)
Inventories 180 618 (315)
Prepaid expenses and other assets 416 440 (1,016)
Accounts payable (18) 66 (402)
Deferred revenue and other liabilities (171) (4,489) 3,435
Net cash provided by (used in) operating activities (651) 335 (7,579)
Cash flows from investing activities:      
Purchases of property and equipment (103) (50) (300)
Net proceeds from sale of assets     12
Proceeds from maturities of marketable securities & short-term investments 1,275   2,604
Purchases of marketable securities & short-term investments (1,568)   (1,602)
Net cash provided by (used in) investing activities (396) (50) 714
Cash flows from financing activities:      
Proceeds from sale of common stock and warrants, net of issuance costs   10,362 1,967
Taxes paid to net share settle equity awards (4) (46)  
Payments on convertible notes   (7,365)  
Net cash provided by (used in) financing activities (4) 2,951 1,967
Net increase (decrease) in cash and cash equivalents (1,051) 3,236 (4,898)
Cash and cash equivalents at beginning of year 7,104 3,868 8,766
Cash and cash equivalents at end of year 6,053 7,104 3,868
Supplemental disclosure:      
Issuance of convertible notes in settlement of accrued interest 187 846 854
Cash paid for income taxes $ 2 $ 15 $ 2