Stockholders' Equity - Issuance of Common Stock and Warrants (Details)		1 Months Ended		6 Months Ended
	Mar. 28, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Jul. 02, 2017 USD ($) $ / shares shares	Jul. 03, 2016 USD ($)	Mar. 15, 2017 USD ($) offering	Jan. 01, 2017 $ / shares
Class of Stock [Line Items]
Shelf Registration, Number of Offerings | offering						1
Shelf registration, maximum offering | $						$ 40,000,000.0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001		$ 0.001			$ 0.001
Underwritten public offering price (in dollars per share)	$ 1.50	$ 1.50	$ 1.00	$ 1.46
Net proceeds | $	$ 15,800,000	$ 15,800,000	$ 8,800,000	$ 17,304,000	$ 10,447,000
June 2012 financing
Class of Stock [Line Items]
Warrants outstanding (in shares) | shares				2,300,000
Strike price of warrants (in dollars per share)				$ 2.98
Common stock
Class of Stock [Line Items]
Aggregate shares of common stock issued | shares	11,300,000.0	11,333,333	10,000,000