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NET INCOME (LOSS) PER SHARE - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss available to common stockholders	$ (28,131)	$ (23,771)	$ (21,482)	$ (15,355)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)	$ (88,739)	$ (104,497)	$ (4,751)
Denominator:
Denominator for basic and diluted calculation (in shares)									94,533	92,017	90,340
Net loss per share - basic and diluted (in dollars per share)	$ (0.29)	$ (0.25)	$ (0.23)	$ (0.16)	$ (0.14)	$ (0.96)	$ (0.01)	$ (0.02)	$ (0.94)	$ (1.14)	$ (0.05)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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