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Share-Based Payment Awards (Tables)

9 Months Ended

Sep. 30, 2019

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 nine months ended September 30, 2019:

						Weighted
				Weighted		Average
				Average		Remaining		Aggregate
	Number			Exercise		Contractual		Intrinsic
	of Options			Price		Life		Value
						(in years)		(in thousands)
Outstanding at January 1, 2019		8,139,377		$	2.83
Granted		4,474,096			2.36
Exercised		(166,760	)		1.84
Forfeited		(1,361,109	)		2.49
Expired		(473,346	)		3.77
Outstanding at September 30, 2019		10,612,258		$	2.65		7.69	$	289
Exercisable at September 30, 2019		4,957,932		$	3.07		6.11	$	41

Schedule of Key Assumptions Used

In determining the grant date fair value of option awards during the nine months ended September 30, 2019, the Company applied the Black-Scholes option pricing model based on the following key assumptions:

Option life (in years)		5.50 - 6.08
Stock volatility		60% - 64%
Risk-free interest rate		1.29% - 2.63%
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 nine months ended September 30, 2019 (in thousands, except per share amount):

	Nine Months Ended
	September 30, 2019
Weighted-average grant date fair value per share	$	0.95
Total cash received from exercise of stock options		308
Total intrinsic value of stock options exercised		63

Summary of Restricted Stock Unit Activity

The following table provides a reconciliation of RSU activity under the 2016 Plan for the nine months ended September 30, 2019:

				Weighted
	Number of			Average
	Restricted			Grant Date
	Stock Units			Fair Value
Nonvested at January 1, 2019		590,213		$	1.86
Granted		587,761			1.90
Vested		(229,294	)		1.81
Forfeited		(136,333	)		2.18
Nonvested at September 30, 2019		812,347		$	1.85

Summary of Performance Stock Unit Activity

The following table provides a reconciliation of PSU activity for the nine months ended September 30, 2019:

				Weighted
	Number of			Average
	Performance			Grant Date
	Stock Units			Fair Value
Nonvested at January 1, 2019		370,000		$	2.01
Vested		(58,334	)		1.56
Forfeited		(255,000	)		2.26
Nonvested at September 30, 2019		56,666		$	1.34

Summary of Deferred Stock Unit Activity

				Weighted
	Number of			Average
	Deferred			Grant Date
	Stock Units			Fair Value
Nonvested at January 1, 2019		35,418		$	1.95
Vested		(35,418	)		1.95
Nonvested at September 30, 2019		—		$	—

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 nine months ended September 30, 2019 and 2018, respectively, as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Compensation expense included in:
Research and development	$	210	$	486	$	874	$	1,145
Sales and marketing		189		263		512		314
General and administrative		578		648		2,325		1,355
	$	977	$	1,397	$	3,711	$	2,814