Stockholders' Equity - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Jun. 30, 2017	Jun. 26, 2016	Jul. 25, 2013	Dec. 31, 2013	Dec. 31, 2017	Jul. 02, 2013
Warrants to Purchase Common Stock
Shares of common stock called by warrants (in shares)						142,534
Mark-to-market income on warrants				$ 313
Shares of common stock issued for net exercise of warrants (in shares)	406		64,067
Warrants outstanding (in shares)					0
Warrants at Exercise Price 3.79
Warrants to Purchase Common Stock
Shares of common stock called by warrants (in shares)			17,607
Common shares tendered to Company upon warrant exercise (in shares)			14,052
Exercise price (in dollars per share)			$ 3.79
Warrants at Exercise Price 4.64
Warrants to Purchase Common Stock
Shares of common stock called by warrants (in shares)			16,210
Common shares tendered to Company upon warrant exercise (in shares)			19,321
Exercise price (in dollars per share)			$ 4.64
Warrants at Exercise Price 1.27
Warrants to Purchase Common Stock
Shares of common stock called by warrants (in shares)			30,250
Common shares tendered to Company upon warrant exercise (in shares)			5,270
Exercise price (in dollars per share)			$ 1.27
Warrants at Exercise Price 5.76
Warrants to Purchase Common Stock
Exercise price (in dollars per share)		$ 5.76
Warrants expired (in shares)		8,694
Warrants at Exercise Price 2.46
Warrants to Purchase Common Stock
Shares of common stock called by warrants (in shares)	31,130
Exercise price (in dollars per share)	$ 2.46