Business Combination - Additional Information (Detail) (Kingsoft Cloud Storage Business [Member], USD $)	0 Months Ended	1 Months Ended
Sep. 05, 2014	Sep. 30, 2014	Sep. 05, 2014
Kingsoft Cloud Storage Business [Member]
Business Acquisition [Line Items]
Cash consideration paid for assets acquired	$ 33,303,000	$ 33,000,000	$ 33,303,000
Consideration for acquisition of share based awards replacement		300,000
Liabilities assumed as part of acquisition	0		0
Replacement award attributable to pre-combination service	303,000
Replacement award attributable to post-combination service	$ 44,000

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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Amount of assets acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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