Share-Based Payments - Summary of Status and Changes of Unvested Restricted Stock (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Restricted Stock
Number of Shares
Unvested, beginning balance (in shares) | shares	41,657
Vested (in shares) | shares	(19,507)
Unvested, ending balance (in shares) | shares	22,150
Weighted-Average Grant Date Fair Value
Unvested beginning balance (in dollars per share) | $ / shares	$ 11.05
Vested (in dollars per share) | $ / shares	10.62
Unvested ending balance (in dollars per share) | $ / shares	$ 11.43
Restricted Stock Units (RSUs)
Number of Shares
Unvested, beginning balance (in shares) | shares	150,932
Vested (in shares) | shares	(134,499)
Cancelled | shares	(13,100)
Unvested, ending balance (in shares) | shares	3,333
Weighted-Average Grant Date Fair Value
Unvested beginning balance (in dollars per share) | $ / shares	$ 2.85
Vested (in dollars per share) | $ / shares	2.83
Cancelled | $ / shares	2.76
Unvested ending balance (in dollars per share) | $ / shares	$ 4.09