Common Stock Warrants and Common Stock Warrant Liability (Details) - $ / shares		6 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Outstanding at beginning		829,285	610,487
Warrants issued			336,531
Warrants exercised			117,733
Outstanding at end		829,285	829,285
Initial Public Offering Underwriter Warrants [Member]
Warrants issued			187,500
Date Issued			2016-12
Term			5 years
Exercise Price (in dollars per share)			$ 9.60
Marketing and Development Services Warrants [Member]
Warrants issued			100,000
Date Issued			2016-02
Term	[1]		5 years
Exercise Price (in dollars per share)			$ 7.50
Other Advisory Services Warrants [Member]
Warrants issued			40,000
Date Issued			2016-08
Term	[1]		3 years
Exercise Price (in dollars per share)			$ 7.50
Promissory Notes [Member]
Warrants issued			9,031
Date Issued			2016-03
Term	[1]		3 years
Exercise Price (in dollars per share)			$ 7.50

[1] The warrants also terminate, if not exercised (i) within two years of the closing of an initial public offering of common stock; or (ii) a liquidation, dissolution or winding up of the Company.