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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Statement of Cash Flows    
Net loss $ (3,494) $ (3,890)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 218 87
Non-cash interest on convertible notes to related parties 108 11
Non-cash interest on convertible notes 199 22
Non-cash discount amortization on convertible notes to related parties (33) 49
Non-cash discount amortization on convertible notes (243) 226
Revaluation of premium conversion derivative (607) 380
Non-cash acquisition of in-process research and development   908
Change in assets and liabilities:    
Prepaid expenses and deposits (148)  
Accounts payable 111 406
Accrued liabilities 103 186
Net cash used in operating activities (3,786) (1,615)
Financing activities    
Proceeds from issuance of convertible notes 2,651 1,650
Proceeds from issuance of convertible notes to related parties 2,500 315
Issuance costs related to convertible notes (10)  
Proceeds from issuance of Series A convertible preferred stock   1,522
Deferred offering costs (149)  
Net cash provided by financing activities 4,992 3,487
Net increase in cash and cash equivalents 1,206 1,872
Cash and cash equivalents at beginning of period 3,620 317
Cash and cash equivalents at end of period 4,826 2,189
Supplemental disclosure of cash flow information:    
Cash paid for interest   2
Supplemental non-cash financing transactions:    
Conversion of convertible notes to Series A preferred stock   2,778
Exercise of premium conversion derivative   685
Redemption value change of Series A preferred stock 299 2,666
Issuance of common stock for acquisition of in‑process research and development   908
Bifurcation of premium conversion derivative related to convertible notes 505 $ 232
Deferred offering costs in accounts payable and accrued liabilities $ 734