STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Since the establishment of the 2009 Plan, the Board of Directors authorized and the Company's shareholders approved the allocation of additional shares of common stock to the 2009 Plan as follows:

Authorization Dates of 2009 Plan Additions	Number of Common Stock Shares Authorized to 2009 Plan
February 27, 2009		2,437,744
May 26, 2011		1,000,000
May 23, 2012		1,122,930
May 23, 2013		2,317,000
May 20, 2014		500,000
June 12, 2015		1,200,000
May 27, 2017		1,900,000

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

For the three months ended March 31, 2020 and March 31, 2019, the fair value of stock options granted was calculated using the following assumptions in the Black-Scholes model:

	Three months ended March 31,
	2020	2019
Expected stock price volatility	none	none
Expected term of options	none	none
Expected dividend yield	none	none
Risk-free interest rate	none	none

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table presents stock-based compensation expense included in the related financial statement line items (in thousands):

	Three months ended March 31,
	2020		2019
Cost of revenue	$	9	$	(32	)
Sales and marketing		610		202
Research & development		240		23
General and administrative		1,402		1,027
Total stock based compensation expense	$	2,261	$	1,220

Schedule of Future Stock-based Compensation Expense, Net of Forfeitures

The following table presents the future stock-based compensation expense, net of forfeitures, for each equity award category as of March 31, 2020 and the weighted average period over which the expense will be recognized:

	Service-based Restricted Stock Awards		Service-based Stock Options		Restricted Stock Units		Performance Stock Units
Unrecognized compensation expense, net of forfeitures (in thousands)	$	5,923	$	50	$	141	$	3,500
Weighted average period over which the above expense will be recognized (in years)		3.01		0.14		1.16		1.68

Schedule of Nonvested Share Activity

The following table summarizes the Company's service-based restricted stock award activity from January 1, 2020 to March 31, 2020:

	Service-based Restricted Stock Awards			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested service-based awards, January 1, 2020		343,010		$	12.77	$	4,379,414
Service-based awards granted		279,078			19.45
Service-based awards vested		(130,103	)		11.69
Service-based awards cancelled		(614	)		16.97
Non-vested Service-based awards, March 31, 2020		491,371			16.85		8,277,194

Summary of Weighted Average Grant Date and Vested Fair Value

The following table summarizes the Company's weighted average grant date fair value and vested fair value for the three months ended March 31, 2020 and March 31, 2019:

	Three months ended March 31,
	2020		2019
Weighted-average grant-date fair value of service-based restricted stock awards granted	$	19.45	$	15.28
Fair value of service-based restricted stock awards vested (in thousands)	$	2,497	$	1,981

Nonvested Restricted Stock Shares Activity

The following table summarizes the Company's PSU activity from January 1, 2020 to March 31, 2020:

	Performance Stock Units			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested PSUs, January 1, 2020		615,614		$	13.84	$	11,167,238
PSUs granted		255,105			16.62
PSUs vested		(168,324	)		10.91
PSUs cancelled		(102,753	)		14.71
Non-vested PSUs, March 31, 2020		599,642		$	15.69	$	8,406,981

Summary of Weighted Average Grant Date Fair Value and Fair Value of Performance Stock Unit

The following table summarizes the Company's weighted average grant date fair value and fair value of PSUs vested for the three months ended March 31, 2020 and March 31, 2019:

	Three months ended March 31,
	2020		2019
Weighted average grant date fair value of PSUs granted	$	16.62	$	15.21
Fair value of PSUs vested (in thousands)	$	2,302	$	3,120

Schedule of Stock Option Activity

The following table summarizes the Company's service-based stock option activity from January 1, 2020 to March 31, 2020:

	Service-based Options			Weighted Average Exercise Price		Weighted Average Contractual Life (years)		Aggregate Intrinsic Value
Service-based options outstanding, January 1, 2020		1,081,592		$	10.06		5.57	$	9,022,107
Service-based options granted		—			—
Service-based options exercised		(5,625	)		7.47
Service-based options cancelled		(6,474	)		25.99
Service-based options outstanding, March 31, 2020		1,069,493			9.98		5.35		4,967,549
Vested and expected to vest at March 31, 2020		1,069,407			9.98		5.35		4,967,549
Exercisable at March 31, 2020		1,057,766			9.84		5.30	$	4,967,549

Summary of Weighted Average Grant Date Fair Value and Intrinsic Value of Options Exercises

The following table summarizes the Company's weighted average grant date fair value and intrinsic value of options exercised for the three months ended March 31, 2020 and March 31, 2019:

	Three months ended March 31,
	2020		2019
Weighted average grant date fair value of service-based stock options granted	$	—	$	—
Intrinsic value of options exercised (in thousands)	$	113	$	1,342

Schedule of Restricted Stock Units Award Activity

The following table summarizes the Company's restricted stock unit activity from January 1, 2020 to March 31, 2020:

	Restricted Stock Units			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Units outstanding, January 1, 2020		265,913		$	12.56	$	4,823,662
Units granted		2,422			19.58
Units released		(432	)		15.11
Units cancelled		—			—
Units outstanding, March 31, 2020		267,903			12.62		3,756,000
Vested and expected to vest at March 31, 2020		266,858			12.60		3,741,344
Vested and deferred at March 31, 2020		256,294		$	12.22	$	3,593,242

Summary of Weighted Average Grant Date Fair value

The following table summarizes the Company's weighted average grant date fair value and fair value of units converted for the three months ended March 31, 2020 and March 31, 2019:

	Three months ended March 31,
	2020		2019
Weighted average grant date fair value of restricted stock units granted	$	19.58	$	15.11
Fair value of restricted stock units converted (in thousands)	$	8	$	—