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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (14,346) $ (4,590)
Adjustments to reconcile net loss to net cash used in operating activities:    
PIK interest expense on convertible promissory notes payable - related parties   1,207
Stock-based compensation expense 1,278  
Depreciation and amortization expense 8  
Changes in operating assets and liabilities:    
Accounts receivable - related parties   7
Prepaid expenses and other current assets 3 (658)
Accounts payable 523 529
Accrued expense 1,113 414
Accrued interest - related party   6
Net cash used in operating activities (11,421) (3,085)
Cash flows from investing activities:    
Purchases of marketable securities (31,113)  
Sales and maturities of marketable securities 20,033  
Purchases of property and equipment (125)  
Net cash used in investing activities (11,205)  
Cash flows from financing activities:    
Proceeds from issuance of common and preferred stock, net of transaction costs 38,278  
Proceeds from convertible notes - related parties   6,875
Net cash provided by financing activities 38,278 6,875
Net increase in cash and cash equivalents 15,652 3,790
Cash and cash equivalents at beginning of period 19,145 306
Cash and cash equivalents at end of period $ 34,797 4,096
Supplemental disclosure of cash flow information:    
Exchange of related party advances payable for convertible notes   500
Related party debt restructuring   $ 11,224