Warrants (Tables)

12 Months Ended

Dec. 31, 2019

Warrants and Rights Note Disclosure [Abstract]

Summary of Warrant Activity

	Number of Warrant Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Weighted Average Fair Value
Outstanding at Outstanding at December 31, 2017	1,012,513		$	14.04	4.5	$	5.07
Exercised	(672,125	)	14.17		0	—
Expired	(7,354	)	21.45		0	—
Outstanding at Outstanding at December 31, 2018	333,034		$	13.39	3.7	$	3.38
Exercised	(15,385	)	13.00		0	—
Reserved for future issuance	1,753,523		1.39		2.2	1.22
Outstanding at Outstanding at December 31, 2019	2,071,172		$	2.05	2.4	$	1.34