Net Loss Per Share Available to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of basic and diluted net loss per common share

(in thousands, except share and per share amounts)	Year Ended December 31,
	2019			2018			2017
Numerator:
Net loss available to common stockholders	$	(12,443	)	$	(29,886	)	$	(30,384	)
Denominator:
Weighted average common shares outstanding—basic	42,274,777			6,287,172			5,457,629
Dilutive effect of stock equivalents resulting from stock options, RSUs, common stock warrants, preferred stock warrants and convertible preferred stock (as converted)	—			—			—
Weighted average common shares outstanding—diluted	42,274,777			6,287,172			5,457,629
Net loss per share available to common stockholders—basic and diluted	$	(0.29	)	$	(4.75	)	$	(5.57	)

Schedule of antidilutive securities excluded from computation of earnings per share

The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because the impact of including them would have been antidilutive:

	Year Ended December 31,
	2019	2018	2017
Options to purchase common stock	5,170,976	—	—
Restricted stock units	149,004	—	—
Convertible preferred stock (as converted)	—	39,953,983	39,361,211
Preferred stock warrants	—	160,767	160,767
Total	5,319,980	40,114,750	39,521,978