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Fair Value Measurements - Roll-Forward of Premium conversion Derivative Liabilities (Details) - Premium conversion derivative - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Roll-forward of the company's premium conversion derivative liabilities    
Balance as of beginning of period $ 345 $ 73
Issuance of underlying convertible notes 505 232
Change in fair value of premium conversion derivative (607) 380
Redemption of underlying convertible notes   $ (685)
Balance as of end of period $ 243