Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands						1 Months Ended			12 Months Ended
	Sep. 04, 2019	Jun. 14, 2019	Sep. 30, 2018	Sep. 04, 2018	Jan. 01, 2017	Apr. 30, 2018	Aug. 31, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Stockholders Equity [Line Items]
Common stock, voting rights									The Company has one class of common shares issued and available. Each share of common stock has the right to one vote per share
Common shares outstanding									17,736,649	11,534,190
Conversion of common stock,description					At the date of the merger, 1.1 million common shares were converted into 1.3 million shares of common shares of the Company
Conversion of common stock					1,300,000
Share issued, value									$ 29,447
Warrants issued to purchase common shares				196,364
Common stock warrants exercise price				$ 15.60
Issuance of warrants related to debt										$ 929
Initial Public Offering
Stockholders Equity [Line Items]
Common stock, shares issued		3,600,000
Stock issuance price		$ 10.00
Net proceeds from sale of common stock		$ 29,400
Horizon Loan Agreement
Stockholders Equity [Line Items]
Warrants issued to purchase common shares									76,923
Common stock warrants exercise price									$ 15.60
Issuance of warrants related to debt									$ 900
Credit and Security Agreement
Stockholders Equity [Line Items]
Warrants issued to purchase common shares									44,871
Common stock warrants exercise price									$ 15.60
Warrants expire period									10 years
Issuance of warrants related to debt									$ 100
Maximum
Stockholders Equity [Line Items]
Conversion of common stock			100,000
Series A Preferred Stock
Stockholders Equity [Line Items]
Common stock, shares issued											18,300,000
Stock issuance price											$ 1.44
Share issued, value											$ 26,300
Conversion of preferred stock into common stock				5,700,000
Series B Preferred Stock
Stockholders Equity [Line Items]
Common stock, shares issued								2,900,000
Stock issuance price								$ 2.98
Share issued, value								$ 8,400
Conversion of preferred stock into common stock				900,000
Series B-1 Preferred Stock
Stockholders Equity [Line Items]
Common stock, shares issued							2,100,000
Stock issuance price							$ 5.03
Share issued, value							$ 10,600
Conversion of preferred stock into common stock	700,000
Series C Preferred Stock
Stockholders Equity [Line Items]
Common stock, shares issued				1,900,000		5,992,750
Stock issuance price				$ 4.00
Share issued, value				$ 6,400
Conversion of preferred stock into common stock				1,500,000
Preferred stock additional shares authorized						15,000,000
Preferred stock additional shares authorized, value						$ 40,000
Stock issuance price						$ 4.00
Share issued, value net of transaction expenses						$ 21,000
Number of preferred shares converted into common stock				500,000
Merger Agreement
Stockholders Equity [Line Items]
Description common stock conversion				1 to 0.3131
Merger Agreement | Series C
Stockholders Equity [Line Items]
Description common stock conversion				one to 0.2564
Common shares outstanding				900,000