Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Changes in level 3 instruments (Details)

v3.19.2
Summary of Significant Accounting Policies - Changes in level 3 instruments (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - Contingent consideration [Member]
6 Months Ended
Jun. 30, 2019
USD ($)
Balance, December 31, 2018 $ (520,000)
Change in fair value 0
Balance, March 31, 2019 $ (520,000)