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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (16,699) $ (10,454)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 122 162
Stock-based compensation 2,745 146
Stock issued for consulting services in connection with the Merger 4,248  
Non-cash rent expense 20  
Non-cash interest expense 511 6,868
Fair value adjustment on preferred stock warrant liability (1,309) (1,275)
Fair value adjustment on derivative liability 2,291  
Loss on conversion of convertible notes 1,170  
Loss on disposal of property and equipment 8 59
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 18 (93)
Accounts payable 69 (258)
Accrued expenses 727 98
Restricted cash (3) (27)
Net cash used in operating activities (6,082) (4,774)
Cash flows from investing activities:    
Cash acquired from the merger transaction 9,671  
Purchases of property and equipment (50) (195)
Net cash provided by (used in) investing activities 9,621 (195)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants 10,000  
Proceeds from exercise of stock options 150  
Proceeds from issuance of convertible promissory notes 4,457 5,050
Proceeds from issuance of term loan 6,910  
Net cash provided by financing activities 21,517 5,050
Net increase in cash 25,056 81
Cash - beginning of period 451 1,425
Cash - end of period 25,507 1,506
Supplemental disclosures of noncash financing and investing activities:    
Promissory note issuance proceeds allocated to beneficial conversion feature   (2,256)
Promissory note issuance proceeds allocated to preferred stock warrants   $ (243)
Conversion of convertible notes and accrued interest into common stock 43,060  
Fair value of assets and liabilities acquired in the Merger:    
Fair value of assets acquired in Merger 23,772  
Fair value of liabilities assumed in Merger (3,022)  
Fair value of net assets acquired in the Merger $ 20,750