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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities      
Net loss $ (43,337) $ (15,917) $ (16,982)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 557 744 922
Stock-based compensation 3,268 2,541 1,850
Changes in valuation of outstanding warrant liability 15,099 (2,059) (486)
(Interest expense paid) non-cash interest expense (25) 20 5
Loss on disposal of equipment 56    
Deferred income taxes 27 62  
Changes in operating assets and liabilities:      
Accounts receivable (1,681) 1,652 (1,304)
Inventories (1,813) (3,740) (601)
Other assets 339 (1,663) (13)
Accounts payable (1,512) 2,506 1,450
Accrued liabilities 2,121 1,971 (336)
Deferred revenue 104 (34) (137)
Net cash used in operating activities (26,797) (13,917) (15,632)
Investing activities      
Purchases of furniture, equipment and leasehold improvements (663) (81) (158)
(Purchases) sales of certain other assets (15) (1) 55
Purchases of investments (30,010)    
Maturities of investments 1,631 287 666
Net cash provided by (used in) investing activities (29,057) 205 563
Financing activities      
Net proceeds from equity incentives and the exercise of warrants 1,684 332 143
Net proceeds from public offering 61,425 14,226 9,273
Proceeds from revolving line of credit 3,102 1,810 2,300
Proceeds from debt, net of discount     4,910
Payments on revolving line of credit (2,926) (920)  
Payments on debt and landlord provided leasehold incentives (4,642) (537) (5,008)
Net cash provided by financing activities 58,643 14,911 11,618
Net increase (decrease) in cash and cash equivalents 2,789 1,199 (3,451)
Cash and cash equivalents, beginning of period 26,696 25,497 28,948
Cash and cash equivalents, end of period 29,485 26,696 25,497
Supplemental disclosures:      
Non-cash conversion of preferred stock to common stock   9,496  
Cash paid for interest 294 460 1,024
Cash paid for income taxes 146 162 125
Non-cash settlement of warranty claim $ 1,272