Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Other than temporary impairment losses on short-term investments	$ 0
Inventory write-offs	0	$ 0	$ 0
Impairment of long-lived assets	0
Excise taxes	1,457,000	1,010,000	584,000
Other indirect taxes	818,000	266,000	300,000
Cost related to charitable care	1,376,000	836,000	254,000
Shipping and handling costs	$ 1,385,000	$ 553,000	$ 431,000
Expected dividend yield	0.00%	0.00%	0.00%
Dividends declared	$ 0
Dividends paid	0
Net revenues	$ 33,087,000	$ 15,490,000	$ 10,359,000
Monthly salary contribution rate by employer	8.33%
Severance costs	$ 356,000	307,000	288,000
Pension expense	404,000	205,000	70,000
Recent accounting pronouncement resulted in reclassification of debt issuance cost	1,400
Sales Revenue Net | Customer One | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Net revenues	$ 5,595,000	$ 2,372,000	$ 2,056,000
Concentration risk percentage	17.00%	15.00%	18.00%
Sales Revenue Net | Customer Two | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Net revenues	$ 2,512,000	$ 2,014,000	$ 1,160,000
Concentration risk percentage	8.00%	12.00%	10.00%
Employee Stock Option
Significant Accounting Policies [Line Items]
Share-based award requisite service period	4 years
Expected dividend yield	0.00%
Field Equipment Under Operating Leases
Significant Accounting Policies [Line Items]
Property and equipment useful life	2 years
Equipment write-downs included in cost of revenue	$ 36,000	$ 12,000	$ 19,000