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Share-Based Payment Awards (Tables)

6 Months Ended

Jun. 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 six months ended June 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		4,162,096			2.43
Exercised		(166,760	)		1.84
Forfeited		(555,474	)		2.55
Expired		(32,100	)		2.26
Outstanding at June 30, 2019		11,547,139		$	2.72		7.68	$	89
Exercisable at June 30, 2019		4,398,395		$	3.18		5.33	$	9

Schedule of Key Assumptions Used

In determining the grant date fair value of option awards during the six months ended June 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		1.76% - 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 six months ended June 30, 2019 (in thousands, except per share amount):

	Six Months Ended
	June 30, 2019
Weighted-average grant date fair value per share	$	0.96
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 six months ended June 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		(206,067	)		1.79
Forfeited		(102,845	)		2.19
Nonvested at June 30, 2019		869,062		$	1.86

Summary of Performance Stock Unit Activity

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

				Weighted
	Number of			Average
	Performance			Grant Date
	Stock Units			Fair Value
Nonvested at January 1, 2019		370,000		$	2.01
Vested		(48,334	)		1.52
Forfeited		(20,000	)		1.77
Nonvested at June 30, 2019		301,666		$	2.10

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		(35,001	)		1.95
Nonvested at June 30, 2019		417		$	2.32

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, 2019 and 2018, respectively, as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Compensation expense included in:
Research and development	$	268	$	345	$	664	$	660
Sales and marketing		179		50		323		50
General and administrative		1,049		579		1,747		707
	$	1,496	$	974	$	2,734	$	1,417