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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net loss $ (11,409) $ (10,668) $ (32,048)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 598 747 998
Stock-based compensation 674 719 2,155
Amortization of intangible assets 111 112 111
Impairment of goodwill 12,856   9,858
Amortization of debt issuance costs 30 45 37
Accrued interest 551 898 650
(Gain) loss on disposal of assets   (12) 4
Changes in assets and liabilities      
Accounts receivable 289 (1,122) 170
Inventories 618 (315) 146
Prepaid expenses and other assets 440 (1,016) 459
Accounts payable 66 (402) (419)
Deferred revenue and other liabilities (4,489) 3,435 (64)
Net cash provided by (used in) operating activities 335 (7,579) (17,943)
Cash flows from investing activities:      
Purchases of property and equipment (50) (300) (646)
Net proceeds from sale of assets   12  
Proceeds from sales and maturities of marketable securities   2,604 50,486
Purchases of marketable securities   (1,602) (36,874)
Net cash provided by (used in) investing activities (50) 714 12,966
Cash flows from financing activities:      
Proceeds from sale of common stock and warrants, net of issuance costs 10,362 1,967 364
Taxes paid to net share settle equity awards (46)    
Proceeds from the issuance of notes payable, net of issuance costs     7,877
Payments on long term debt (7,365)    
Payments on capital lease obligations     (138)
Net cash provided by financing activities 2,951 1,967 8,103
Net increase (decrease) in cash and cash equivalents 3,236 (4,898) 3,126
Cash and cash equivalents at beginning of year 3,868 8,766 5,640
Cash and cash equivalents at end of year 7,104 3,868 8,766
Supplemental disclosure:      
Issuance of convertible notes in settlement of accrued interest 846 854 336
Cash paid for income taxes $ 15 $ 2 $ 21