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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Issuance of shares of Common Stock upon exercise of stock options and restricted stock units	506,199	400,292	1,044,745	343,592	369,109	623,709
Issuance of shares of Common Stock under the ESPP		143,379			150,538
Issuance of shares of Common Stock for services rendered	1,629	1,444	1,200	1,242	1,281	1,032
Issuance of shares of Common Stock upon conversion of convertible senior notes				38	38	539

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Number of shares issued during the period as a result of an employee stock purchase plan.

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