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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Statement of Cash Flows [Abstract]    
Net loss from continuing operations $ (4,824) $ (21,780)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 777 181
Non-cash stock-based compensation 1,278 759
Change in fair value of common stock warrants (10,520) 3,115
Change in fair value of contingent consideration (5,327) 238
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 141 256
Litigation settlement insurance recovery 21,700 0
Litigation settlement payable (19,900) 0
Accounts payable (324) (825)
Accrued expenses and other current liabilities (589) (1,380)
Net cash used in continuing operating activities (17,588) (19,436)
Net loss from discontinued operations 6,280 4,417
Changes in operating assets and liabilities attributable to discontinued operations (839) 437
Net cash used in discontinued operating activities (7,119) (3,980)
Net cash used in operating activities (24,707) (23,416)
Cash flows from investing activities:    
Cash paid for purchase of equipment and furnishings (6) (34)
Net cash used in continuing investing activities (6) (34)
Selling costs paid for sale of commercial assets (1,050)  
Cash paid for commercial assets   (534)
Net cash used in discontinued investing activities (1,050) (534)
Net cash used in investing activities (1,056) (568)
Cash flows from financing activities:    
Net proceeds from issuance of common stock 20,189 47,416
Net proceeds from exercise of stock options 261 1
Proceeds from exercise of warrants 233 0
Proceeds from common stock issued in connection with ESPP 78 110
Net proceeds from issuance of long-term debt 23,641 0
Minimum cash covenant on long-term debt (24,000) 0
Principal payments on long-term debt (4,779) (1,914)
Net cash provided by financing activities 15,623 45,613
Net (decrease) increase in cash and cash equivalents (10,140) 21,629
Cash and cash equivalents at the beginning of period 29,730 23,650
Cash and cash equivalents at end of period 19,590 45,279
Supplemental disclosure of cash flow information:    
Cash received during the periods for interest 49 2
Cash paid during the periods for interest 606 312
Supplemental disclosure of non-cash investing and financing activities:    
Fair value of warrants issued in connection with common stock recorded as cost of equity 5,590 10,296
Reclassification of warrant liabilities upon exercise $ (324) $ 0