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Stockholders' Equity - ESPP (Details) - ESPP - $ / shares	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018	Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuance (in shares)			880,000
Automatic annual increase in common stock reserved for issuance, percentage			1.00%
Maximum annual increase of shares reserved			1,000,000
Automatic annual increase in common stock reserved for issuance, shares		566,316
Purchases made under the ESPP	136,321
Weighted-average price per share	$ 21.16

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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

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