Stock-based Compensation - 2014 Employee Stock Purchase Plan (Details) - 2014 Employee Stock Purchase Plan - shares		6 Months Ended
	May 02, 2014	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
For possible future issuance under employee stock purchase plan (in shares)	47,794
Common stock issuable period	10 years
Common stock outstanding percentage	0.80%
Employee stock purchase plan, number of shares, which might be added to common stock outstanding (in shares)	29,411
Number of shares of common stock for future issuance, board of directors prerogative, increase in period (in shares)	0
Aggregate number of shares of the Company's common stock that may be issued (in shares)		29,411	29,411
Common stock issued through employee stock purchase plan (in shares)		7,667	1,229
Possible future issuance under equity compensation plan (in shares)		94,082		72,338