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