Fair Value Measurements - Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Liabilities:
Warrant liability	$ 27	$ 52
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	8,002	7,027
Total assets measured and recorded at fair value	8,002	7,027
Liabilities:
Warrant liability	27	52
Contingent consideration	5,180	4,912
Total liabilities measured and recorded at fair value	5,207	4,964
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)
Assets:
Cash equivalents	8,002	7,027
Total assets measured and recorded at fair value	8,002	7,027
Liabilities:
Warrant liability	0	0
Contingent consideration	0	0
Total liabilities measured and recorded at fair value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable  Inputs (Level 2)
Assets:
Cash equivalents	0	0
Total assets measured and recorded at fair value	0	0
Liabilities:
Warrant liability	0	0
Contingent consideration	0	0
Total liabilities measured and recorded at fair value	0	0
Fair Value, Measurements, Recurring | Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	0	0
Total assets measured and recorded at fair value	0	0
Liabilities:
Warrant liability	27	52
Contingent consideration	5,180	4,912
Total liabilities measured and recorded at fair value	$ 5,207	$ 4,964