Stock-Based Compensation

Equity Incentive Plan

At March 31, 2020, 578,379 shares remained available for future grant under the 2016 Equity Incentive Plan. No other plans had options or awards available for grant.

The Company recorded total non-cash compensation, including non-cash compensation to employees and nonemployees in the consolidated statements of operations and comprehensive loss as follows (in thousands):



	Three Months Ended March 31,
	2020		2019
Cost of revenue	$	1	$	39
Research and development	98		219
Selling, general and administrative	371		847
Total	$	470	$	1,105

Unrecognized stock-based compensation expense at March 31, 2020 for all stock-based compensation pertaining to options was approximately was approximately $1.0 million, which is expected to be recognized over a weighted-average term of 2.63 years.

Incentive Stock Options

The following table summarizes stock option transactions for the 2016 Equity Incentive Plan for the three months ended March 31, 2020 (in thousands, except shares and per share data):



	Number of shares		Weighted- average exercise price per share		Weighted- average remaining contractual life (in years)	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2019	518,468		$	38.64
Options granted	27,000		1.87
Options exercised	—		—
Options canceled	(49,016	)	23.70
Outstanding at March 31, 2020	496,452		$	38.11	6.24	$	—
Vested and expected to vest at March 31, 2020	461,421		$	39.98	6.15	$	—
Vested and exercisable at March 31, 2020	308,207		$	48.71	5.83	$	—

The weighted-average fair value of options granted during the three months ended March 31, 2020 was $1.12.

Restricted Stock Awards

The following table summarizes restricted stock award transactions for the 2016 Equity Incentive Plan for the three months ended March 31, 2020:



	Number of awards		Weighted- average grant date fair value
Outstanding at December 31, 2019	29,524		$	39.64
Awards granted	—		—
Awards released	(26,524	)	36.03
Awards canceled	—		—
Outstanding at March 31, 2020	3,000		$	71.50

The Company's current restricted stock awards vest 100% at various terms from the grant date, subject to continued employment. The fair-value of each restricted stock award is determined on the grant date using the closing price of the Company's common stock on the grant date. Unamortized expense of $0.1 million is expected to be recognized over a weighted-average period of 1.3 years.

Restricted Stock Units

The following table summarizes restricted stock unit transactions for the 2016 Equity Incentive Plan for the three months ended March 31, 2020:



	Number of shares		Weighted-average grant date fair value		Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2019	55,574		$	11.70
Awards granted	816,081		1.88
Awards released	(8,696	)	23.00
Awards canceled	(88,225	)	1.88
Outstanding at March 31, 2020	774,734		$	2.35	$	558

The Company's current restricted stock units vest 100% at various terms from the grant date, subject to continued service. The fair-value of each restricted stock unit is determined on the grant date using the closing price of the Company's common stock on the grant date. Unamortized expense of $1.4 million is expected to be recognized over a weighted-average period of 2.6 years.

In June 2020, an additional 727,856 restricted stock units (originally granted in January 2020) were canceled.