STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended			12 Months Ended
	Dec. 17, 2020	Dec. 22, 2019	Mar. 01, 2019	Jun. 30, 2020	May 31, 2020	May 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 05, 2019	Dec. 31, 2018
Preferred stock, shares authorized							10,000,000
Preferred stock, par value (in dollars per share)							$ 0.001
Common Stock, Shares Authorized							175,000,000	175,000,000
Common stock, par value (in dollars per share)							$ 0.001	$ 0.001
Net proceeds from offering			$ 27,500
Shares issued			4,100,000
Share Price			$ 5.87
Payments of underwriting discounts and offering expenses			$ 200
Treasury stock shares							41,309	41,309
Treasury stock amount							$ 234	$ 234
Restricted stock outstanding							1,088,750
Options outstanding							2,467,537	2,526,166	2,605,730		1,916,900
Stock-based compensation expense							$ 61,274	$ 80,289	$ 11,335
Expected weighted-average period in years of compensation cost to be recognized							1 year
Warrants [Member]
Warrants Outstanding							147,058	115,042
Weighted average exercise price of warrants							$ 4.08
Restricted stock
Restricted stock outstanding							12,032,040	10,785,034	7,091,789		6,095,692
Stock-based compensation expense							$ 58,400	$ 74,200	$ 7,800
Unrecognized compensation cost							$ 50,700
Number of shares granted							2,738,974	4,909,829	1,851,520
Employees tock options
Stock-based compensation expense							$ 2,900	$ 6,000	$ 3,500
Recognized stock based compensation expense							1,400
Unrecognized compensation cost							$ 200
Milestone Based Restricted Stock [Member]
Restricted stock outstanding							4,016,281
Institutional Investor [Member]
Net proceeds from offering		$ 50,000
Shares issued		5,434,783
Share Price		$ 9.20
2017 ATM [Member]
Percent of commission rate						3.00%
Gross proceeds from offering									99,300
Net proceeds from offering									$ 97,500
Shares issued									13,620,165
Share Price									$ 7.29
2017 ATM [Member] | Maximum [Member]
Net proceeds from offering						$ 300,000
2020 ATM [Member]
Percent of commission rate										3.00%
Gross proceeds from offering								$ 187,500
Share price in offering								$ 21.99
Net proceeds from offering								$ 184,200
Shares issued								8,528,286
2021 ATM [Member]
Gross proceeds from offering							$ 2,500	$ 33,900
Net proceeds from offering							$ 2,400	$ 33,300
Shares issued							72,000	804,100
Share Price							$ 34.25	$ 42.18
Underwritten Public Offering [Member]
Gross proceeds from offering	$ 297,200
Net proceeds from offering	$ 19,000				$ 165,100
Shares issued	6,320,000				8,500,000
Share Price	$ 43.50				$ 18
Payments of underwriting discounts and offering expenses					$ 10,800
Over-Allotment Option [Member]
Shares issued	948,000		615,000		1,275,000
Period of underwriter overallotment option	30 days		30 days
Amended and Restated 2012 Incentive Plan [Member]
Number of additional shares that may be issued							1,511,105
Amended and Restated 2012 Incentive Plan [Member] | Restricted stock
Restricted stock outstanding							12,032,040	10,785,034
Amended and Restated 2012 Incentive Plan [Member] | Employees tock options
Number of shares added to the plan				8,000,000
Options outstanding							2,467,537	2,526,166