STOCKHOLDERS' EQUITY, STOCK-BASED COMPENSATION AND NET LOSS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Stock option activity under equity incentive plans

The following table summarizes activity under our equity incentive plans related to equity-classified stock option grants as of June 30, 2019, and changes during the six months then ended:

	Shares		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019	10,874,849		$	4.36
Granted	25,000		1.66
Exercised	(2,250	)	1.99
Forfeited, cancelled or expired	(94,742	)	3.82
Outstanding at June 30, 2019	10,802,857		$	4.35	6.3	$	—
Options exercisable at June 30, 2019	10,802,857		$	4.35	6.3	$	—

The following table summarizes activity under our equity incentive plans related to the China Cash Bonuses as of June 30, 2019, and changes during the six months then ended:

	Shares		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019	1,464,750		$	5.60
Granted	152,000		1.56
Forfeited, cancelled or expired	(280,250	)	5.79
Outstanding at June 30, 2019	1,336,500		$	5.09	8.1	$	—
Bonuses exercisable at June 30, 2019	709,250		$	5.37	7.3	$	—