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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 595	$ 1,751
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0005	$ 0.0005
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	77,603,189	76,525,581
Common stock, shares outstanding (in shares)	76,048,360	75,292,383
Treasury stock, shares (in shares)	1,554,829	1,233,198

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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