Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, issued (in shares)	37,247,000	36,055,000
Common stock, outstanding (in shares)	36,902,000	35,936,000
Treasury stock at cost (in shares)	345,000	119,000