Fair value of financial instruments (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Schedule of financial liabilities at fair value on a recurring basis

			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
	Balance at		Identical		Observable		Unobservable
	March 31,		Assets		Inputs		Inputs
	2021		(Level 1)		(Level 2)		(Level 3)
Liabilities:
Warrant liability	$	2,360	$	—	$	—	$	2,360
Contingent consideration – Long term portion	$	6,260	$	—	$	—	$	6,260
	$	8,620	$	—	$	—	$	8,620

			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
	Balance at		Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
	2020		(Level 1)		(Level 2)		(Level 3)
Liabilities:
Warrant liability	$	490	$	—	$	—	$	490
Contingent consideration – Long term portion	$	6,984	$	—	$	—	$	6,984
	$	7,474	$	—	$	—	$	7,474

Warrant liability

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Schedule of changes in the fair value of the liability

Balance as of December 31, 2019	$	192
Change in fair value of warrant liability		—
Balance as of March 31, 2020	$	192

Balance as of December 31, 2020	$	490
Change in fair value of warrant liability		1,870
Balance as of March 31, 2021	$	2,360

Schedule of significant unobservable inputs for fair value measurements

	Fair Value
	as of
	March 31,		Valuation	Unobservable
Warrant Liability	2021		Technique	Inputs
Warrant to purchase 368,780 shares of Series D Preferred Stock	$	2,360	Black Scholes option pricing model	Expected volatility, term, risk-free rate

Contingent consideration - Long term portion

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Schedule of changes in the fair value of the liability

Balance as of December 31, 2019	$	8,139
Contingent consideration paid		(171)
Reclassification of FY 2020 payment to accrued expenses		(1,590)
Change in contingent consideration value		(1,474)
Balance as of March 31, 2020	$	4,904

Balance as of December 31, 2020	$	6,984
Reclassification of FY 2021 payment to accrued expenses		(1,150)
Change in contingent consideration value		426
Balance as of March 31, 2021	$	6,260

Schedule of significant unobservable inputs for fair value measurements

		Fair Value
		as of
		March 31,	Valuation	Unobservable
Contingent Consideration Liability		2021	Technique	Inputs
Revenue-based Payments	$	6,260	Discounted Cash Flow Analysis under the Income Approach	Revenue discount factor, discount rate