Common Stock - Reconciliation of Changes in Common Shares Issued and Additional Disclosures (Details)	9 Months Ended
	Sep. 30, 2016 series $ / shares shares	Dec. 31, 2015 $ / shares shares
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000	100,000
Preferred stock, minimum number of series authorized | series	1
Preferred stock, at par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued, beginning balance (in shares)	56,220,214
Issued in sale of common stock (in shares)	2,450,339
Issued to purchase IPI (in shares)	247,764
Issued as restricted stock award grants (in shares)	572,240
Issued upon exercise of stock options (in shares)	114,112
Shares issued, ending balance (in shares)	59,604,669