Stock-Based Compensation and Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of the stock option activity including weighted average exercise prices, options outstanding and exercisable

A summary of the stock option activity, weighted average exercise prices, options outstanding and exercisable as of December 31, 2019, 2018 and 2017 is as follows (in thousands except weighted average exercise price):

	Years ended December 31,
	2019				2018				2017
	Common Stock Options		Weighted Average Exercise Price		Common Stock Options		Weighted Average Exercise Price		Common Stock Options		Weighted Average Exercise Price
Outstanding, December 31, 2018	5,903		$	13.72	5,284		$	19.58	3,359		$	39.92
Granted	1,610		$	4.26	1,293		$	1.67	3,024		$	3.50
Exercised	(80	)	$	2.66	—		$	—	(20	)	$	1.64
Expired or forfeited	(653	)	$	21.16	(674	)	$	36.54	(1,079	)	$	38.17
Outstanding, December 31, 2019	6,780		$	10.89	5,903		$	13.72	5,284		$	19.58

	Years ended December 31,
	2019		2018		2017
Options exercisable at December 31, 2019	3,317		2,709		1,954
Weighted average grant date fair value (per share) of options granted during the period	$	3.37	$	1.20	$	2.45

Summary of the stock options outstanding and exercisable

A summary of the stock options outstanding and exercisable as of December 31, 2019 is as follows (in thousands except exercise prices and weighted average exercise price):

			December 31, 2019
			Options Outstanding			Options Exercisable
Range of Exercise Prices	Total Options Outstanding		Weighted Average Remaining Life (Years)	Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$1.13-$2.79	1,350		8.8	$	1.59	433		$	1.76
$2.80-$2.96	1,725		7.9	$	2.93	876		$	2.93
$2.97-$4.87	1,444		8.1	$	4.18	648		$	4.48
$4.88-$31.09	1,090		8.7	$	7.13	216		$	14.89
$31.10-$73.22	1,171		5.1	$	45.14	1,144		$	45.01
	6,780		7.8	$	10.89	3,317		$	18.38
Aggregate Intrinsic Value	$	28,475				$	10,557

Schedule of cash proceeds from, and the aggregate intrinsic value of, stock options exercised

Cash proceeds from, and the aggregate intrinsic value of, stock options exercised during the years ended December 31, 2019, 2018 and 2017, respectively, were as follows:

	Years ended December 31,
	2019		2018		2017
Cash proceeds from options exercised	$	192	$	—	$	33
Aggregate intrinsic value of options exercised	$	135	$	—	$	43

Summary of the Company's outstanding shares of RSU awards

The following table presents a summary of the Company's outstanding RSU awards granted as of December 31, 2019 (in thousands except weighted average grant-date fair value):

	Restricted Stock Units		Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2018	679		$	15.61
Awarded	1,090		$	4.57
Vested	(255	)	$	13.94
Forfeited	(33	)	$	16.35
Outstanding, December 31, 2019	1,481		$	7.79