Subsequent Events - Narrative (Details)				1 Months Ended
	Aug. 10, 2015 USD ($) $ / shares shares	Jul. 20, 2015 USD ($) ft²	Jul. 01, 2015 shares	Jul. 31, 2012 shares	Jun. 30, 2015 ft² shares	Dec. 31, 2014 shares
Subsequent Event [Line Items]
Common stock shares authorized					50,000,000	50,000,000
Rentable area (in sqft) | ft²					12,118
Subsequent event
Subsequent Event [Line Items]
Common stock shares authorized			50,000,000
Common stock conversion ratio			0.125
Monthly rent expense | $		$ 39,384
Increase in annual base rate (percent)		3.00%
Price per share (in usd per share) | $ / shares	$ 18.00
IPO
Subsequent Event [Line Items]
Number of shares issued in public offering				1,973,000
IPO | Subsequent event
Subsequent Event [Line Items]
Number of shares issued in public offering	5,462,500
Proceeds from issuance of IPO | $	$ 92,000,000
Over-Allotment Option | Subsequent event
Subsequent Event [Line Items]
Number of shares issued in public offering	712,500
Amended Lease Agreement | Subsequent event
Subsequent Event [Line Items]
Rentable area (in sqft) | ft²		9,916
Renewal term		5 years
Delivery period for new property		45 days
Monthly rent expense | $		$ 32,227
Rent abatement period		60 days
Rent abatement contingency period maximum		21 days