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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (14,871) $ (15,248)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 287 206
Stock-based compensation 2,044 2,522
Amortization of intangible assets 265 500
Changes in assets and liabilities:    
Accounts receivable (243) (159)
Inventories (379) 127
Prepaid expenses and other assets 14 (226)
Accounts payable (54) 286
Accrued expenses and other liabilities (130) 68
Net cash used in operating activities (13,067) (11,924)
Cash flows from investing activities:    
Purchases of property and equipment (131) (104)
Proceeds from sales and maturities of marketable securities 20,741 22,807
Purchases of marketable securities (27,726) (13,792)
Net cash (used in) provided by investing activities (7,116) 8,911
Cash flows from financing activities:    
Proceeds from the sale of common stock, net of issuance costs 21,368  
Proceeds from issuance of common stock 1,307 1,689
Net cash provided by financing activities 22,675 1,689
Net increase (decrease) in cash and cash equivalents 2,492 (1,324)
Cash and cash equivalents at beginning of period 3,110 4,364
Cash and cash equivalents at end of period $ 5,602 $ 3,040