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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Operating activities:        
Net income (loss) $ 243 $ (3,511) $ (7,371) $ 1,322
Adjustments to reconcile net income (loss) to net cash used in operating activities:        
Depreciation of property and equipment 1 2 6 9
Amortization of other assets 52 53 210 214
Noncash stock-based compensation, including stock options and restricted stock 26 120 429 575
Change in fair value of warrant liability (1,009) 2,751 4,277 (5,020)
Warrant inducement     0 14
Inventory reserve (2) 17 59 210
Amortization of debt discount 0 142 320 257
Gain on disposal of property and equipment     0 (3)
(Gain)/loss on foreign currency transactions (40) 1 (48) 26
(Increase) decrease in operating assets:        
Accounts receivable (224) (355) 12 820
Inventory (20) (46) (82) (60)
Prepaid expenses and other current assets 22 53 21 (16)
Increase (decrease) in operating liabilities:        
Accounts payable (39) (40) (190) (23)
Accrued expenses 90 (172) 78 121
License and supply agreement fee payable     0 (1,318)
Deferred revenue (17) 363 (216) (711)
Net cash used in operating activities (917) (622) (2,495) (3,583)
Investing activities        
Proceeds from sales of property and equipment     0 3
Net cash provided by investing activities     0 3
Financing activities:        
Proceeds from issuance of common stock, net of equity issuance costs 0 2,016 4,866 2,771
Proceeds from issuance of senior secured notes     1,572 2,800
Payment of financing costs     0 (399)
Proceeds from exercise of warrants 1 1 15 248
Payment of senior secured note 0 (1,500) (3,250) (1,300)
Net cash provided by financing activities 1 517 3,203 4,120
Effect of exchange rates on cash (1) (1) (3) (8)
Net increase (decrease) in cash (917) (106) 705 532
Cash, beginning of period 1,284 579 579 47
Cash, end of period 367 473 1,284 579
Supplemental disclosure of cash flow information        
Cash paid for interest $ 14 $ 77 188 54
Cash paid for taxes     6 2
Restricted stock issued to settle liability     $ 101 $ 77