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Share-Based Payment Awards (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table provides a reconciliation of stock option activity under the Company’s equity incentive plans and for inducement awards for the six months ended June 30, 2021:

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number			Exercise		Contractual		Intrinsic
	of Options			Price		Life		Value
						(in years)		(in thousands)
Outstanding at January 1, 2021		1,338,880		$	20.86
Granted		833,727			12.98
Exercised		(827	)		11.65
Forfeited		(48,304	)		17.31
Expired		(23,666	)		31.92
Outstanding at June 30, 2021		2,099,810		$	17.69		8.05	$	134
Exercisable at June 30, 2021		834,187		$	23.42		6.35	$	3

Schedule of Key Assumptions Used

In determining the grant date fair value of option awards during the six months ended June 30, 2021, the Company applied the Black-Scholes option pricing model based on the following key assumptions:

Option life (in years)		4.75 - 6.08
Stock volatility		72.5% - 83.07%
Risk-free interest rate		0.42% - 1.18%
Expected dividends		0.0%

Summary of Information about Stock Options

The following table summarizes information about employee, non-executive director and external consultant stock options for the six months ended June 30, 2021 (in thousands):

	Six Months
	Ended
	June 30, 2021
Weighted-average grant date fair value per share	$	8.41
Total cash received from exercise of stock options		10
Total intrinsic value of stock options exercised		2

Summary of Restricted Stock Unit Activity

The following table provides a reconciliation of RSU activity under the 2016 Plan for the six months ended June 30, 2021:

				Weighted
	Number of			Average
	Restricted			Grant Date
	Stock Units			Fair Value
Nonvested at January 1, 2021		149,004		$	13.85
Granted		227,141			13.06
Vested		(80,909	)		14.61
Forfeited		(4,319	)		11.72
Nonvested at June 30, 2021		290,917		$	13.05

Compensation Expense from Stock-Based Payment Awards

The Company’s consolidated statements of comprehensive loss included total compensation expense from stock-based payment awards for the three and six months ended June 30, 2021 and 2020, respectively, as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2021		2020			2021		2020
Compensation expense included in:
Research and development	$	255	$	(49	)	$	518	$	214
Sales and marketing		241		141			481		393
General and administrative		684		643			1,169		1,288
	$	1,180	$	735		$	2,168	$	1,895