Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - shares shares in Thousands		3 Months Ended		12 Months Ended
	Apr. 01, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Securities excluded from net loss per share calculation (in shares)		137	219
Warranty service periods	10 years
Minimum
Concentration Risk [Line Items]
Warranty service periods			1 year
Maximum
Concentration Risk [Line Items]
Warranty service periods			5 years
Geographic concentration risk | United States
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		98.00%
Revenue | Geographic concentration risk | Countries outside of the United States
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		2.00%	6.00%
Global Healthcare Systems, Northeast Ohio | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		22.00%	12.00%
Global Healthcare Systems, Northeast Ohio | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		18.00%
Atlantic Diving Supply, Inc. | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		14.00%	19.00%
Atlantic Diving Supply, Inc. | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		18.00%		63.00%
Huntington Ingalls, Incorporated | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		10.00%
Huntington Ingalls, Incorporated | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		15.00%
U.S. Navy | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)		24.00%	39.00%
DFAS Columbus | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk (less than for one percent)			20.00%