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Financial Statement Details - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Statement Details [Abstract]
Insurance claim receivable	$ 1,576	$ 340
Prepaid license fees	843	597
Interest receivable - marketable debt securities	615	764
Equipment deposits	442	482
Prepaid insurance	381	572
Prepaid rent	373	373
Prepaid supplies	243	210
Prepaid services	157	416
Other	328	398
Total prepaid expenses and other current assets	$ 4,958	$ 4,152

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Prepaid license fees.

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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