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Fair Value Measurements - Fair Value On a Recurring Basis (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 12,212,025	$ 1,552,852	$ 5,865,611	$ 1,997,192
Common stock warrant liability	48,145,520	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Assets
Cash and cash equivalents	12,212,025	1,552,852
Common stock warrant liability	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Assets
Cash and cash equivalents	0	0
Common stock warrant liability	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Assets
Cash and cash equivalents	0	0
Common stock warrant liability	$ 48,145,520	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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