Consolidated Balance Sheets (Unaudited) - Parenthetical - shares	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Statement of Financial Position [Abstract]
Common stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, shares issued (in shares)	28,713,000	28,630,000	27,558,000
Common stock, shares outstanding (in shares)	28,713,000	28,630,000	27,558,000