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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating activities        
Net loss $ (6,662) $ (1,002) $ (8,036) $ (2,105)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization     16 20
Stock-based compensation     236 85
Loss on disposal of fixed assets     31  
Changes in operating assets and liabilities:        
Prepaid expenses and other assets     (1,167) 45
Accounts payable and accrued expenses     7 (207)
Net cash used in operating activities     (8,913) (2,162)
Investing activities        
Cash received from merger transaction     23,250  
Proceeds from sale of equipment     8  
Purchase of property and equipment       (10)
Net cash provided by (used in) investing activities     23,258 (10)
Financing activities        
Proceeds from issuance of common stock, net     4,000  
Proceeds from exercise of warrants     3,119  
Net cash provided by financing activities     7,119  
Net increase (decrease) in cash, cash equivalents and restricted cash     21,464 (2,172)
Cash, cash equivalents and restricted cash at beginning of period     1,117 3,109
Cash, cash equivalents and restricted cash at end of period $ 22,581 $ 937 22,581 $ 937
Noncash activities:        
Conversion of promissory notes and interest to common stock     3,447  
Conversion of preferred stock to common stock     9  
Conversion of contingently issuable shares to common stock     291  
Fair value of assets acquired, excluding cash and restricted cash     3,072  
Fair value of liabilities assumed     (2,947)  
Fair value of net assets acquired in the merger     $ 125