CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Preferred stock, par value (USD per share)	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, authorized	250,000,000	250,000,000
Common stock, issued	36,799,000	36,298,000
Common stock, outstanding	36,799,000	36,298,000
Preferred stock, Series A
Preferred stock, authorized	200,000	200,000
Preferred stock, Undesignated series
Preferred stock, authorized	59,800,000	59,800,000