Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity

Summary of changes in Shareholders' Equity

The changes in shareholders’ equity for three months ended March 31, 2020 were as follows:

				Additional				Total
	Common Stock			Paid- In		Accumulated		Shareholders’
	Shares		Amount	Capital		Deficit		Equity (Deficit)
Balance, December 31, 2019	33,678,840	$	34	$	447,297	$	(359,899)	$	87,432
Exercise of common stock options	455,573		—		4,454		—		4,454
Issuance for employee stock purchase plan	39,411		—		357		—		357
Vesting of restricted stock units ("RSUs")	195,280		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(63,064)		—		(1,358)		—		(1,358)
Stock-based compensation	—		—		4,951		—		4,951
Equity component of 2020 Convertible Notes, net of issuance costs of $1,773	—		—		44,777		—		44,777
Net income	—		—		—		450		450
Balance, March 31, 2020	34,306,040	$	34	$	500,478	$	(359,449)	$	141,063

The changes in shareholders’ equity for three months ended March 31, 2019 were as follows:

				Additional				Total
	Common Stock			Paid- In		Accumulated		Shareholders’
	Shares		Amount	Capital		Deficit		Equity (Deficit)
Balance, December 31, 2018	33,265,629	$	33	$	428,729	$	(337,177)	$	91,585
Exercise of common stock options	18,693		—		246		—		246
Issuance for employee stock purchase plan	32,826		—		444		—		444
Vesting of RSUs	101,483		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(33,503)		—		(488)		—		(488)
Stock-based compensation	—		—		4,263		—		4,263
Net loss	—		—		—		(9,700)		(9,700)
Balance, March 31, 2019	33,385,128	$	33	$	433,194	$	(346,877)	$	86,350