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Fair Value Measurements - Summary of Changes in Fair Value of Company's Preferred Warrant Liability (Details) - Contingent Consideration
6 Months Ended
Jun. 30, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 0
Amounts acquired 1,718,000
Accretion 63,667
Balance at end of period $ 1,781,667