Line of Credit - Additional Information (Detail)
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12 Months Ended |
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Dec. 31, 2016
USD ($)
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Jul. 31, 2014
USD ($)
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Mar. 31, 2013
USD ($)
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| Line of Credit Facility [Line Items] |
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| Draws against the facility |
$ 0
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| Line of credit facility, remaining borrowing capacity available |
$ 5,000,000
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| Liquidity and debt ratios required under debt covenant |
1.5
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| Revolving credit facility expiring June 2016 [Member] |
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| Line of Credit Facility [Line Items] |
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| Line of credit facility, maximum credit availability |
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$ 6,500,000.0
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| Revolving credit facility expiring June 2016 [Member] | London Inter Bank Offer Rate [Member] |
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| Line of Credit Facility [Line Items] |
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| Basis spread for interest (as percent) |
1.75%
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| Revolving credit facility expiring June 2016 [Member] | Prime rate [Member] |
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| Line of Credit Facility [Line Items] |
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| Basis spread for interest (as percent) |
0.75%
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| Letter of credit [Member] |
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| Line of Credit Facility [Line Items] |
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| Interest rate on letter of credit (as percent) |
1.50%
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| Letter of credit [Member] | Lease Amendment [Member] |
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| Line of Credit Facility [Line Items] |
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| Letter of credit |
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$ 1,500,000.0
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