Original and Further Restatement of the Consolidated Financial Statements - Effects of Restatements of Condensed Consolidated Statement of Cash Flow (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities:
Net income	$ (2,508)		$ 3,447
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,746		5,067
Amortization of debt costs	180		180
Amortization of exclusivity agreements	346		311
Provision for doubtful accounts	108		1,368
Deferred income taxes	(246)		(6)
Share-based compensation	1,187		1,943
Excess income tax benefit on employee stock-based awards	(29)		(78)
Other	14		421
Change in operating assets and liabilities:
Trade accounts receivable	(2,607)		9,665
Inventories	2,487		(2,106)
Prepaid expenses and other current assets	(3,464)		4,843
Trade accounts payable	(6,670)		(7,247)
Other current liabilities	(4,606)		(162)
Long-term assets	130		(1,553)
Long-term liabilities	(280)		(1,039)
Net cash provided by operating activities	(10,212)		15,054
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(3,691)		(6,029)
Capital expenditures for intangible assets	(46)		(44)
Sale of other investments	32		(506)
Net cash used in investing activities	(3,705)		(6,579)
Cash flows from financing activities:
Net proceeds from issuance of common shares	5,542		2,143
(Repayment of) proceeds from bank borrowings, net			(15)
Changes in restricted cash	4,502		(8,141)
Excess income tax benefit on employee stock-based awards	29		78
Net cash provided by financing activities	10,073		(5,935)
Effect of exchange rate changes on cash	37		(433)
Net decrease in cash and cash equivalents	(3,807)		2,107
Cash and cash equivalents at the beginning of the period	28,924		30,767
Cash and cash equivalents at the end of the period	25,117	[1]	32,874
Originally Reported [Member]
Cash flows from operating activities:
Net income	(782)
Restatement Adjustments [Member]
Cash flows from operating activities:
Net income			2,384
Original Restatement [Member]
Cash flows from operating activities:
Net income			4,500
Further Restatement Adjustments [Member]
Cash flows from operating activities:
Net income	(1,726)		(1,053)
Further Restatement [Member]
Cash flows from operating activities:
Net income	2,508		3,447
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,746		5,067
Amortization of debt costs	180		180
Amortization of exclusivity agreements	346		311
Provision for doubtful accounts	108		1,368
Deferred income taxes	(246)		(6)
Share-based compensation	1,187		1,943
Excess income tax benefit on employee stock-based awards	(29)		(78)
Other	14		421
Change in operating assets and liabilities:
Trade accounts receivable	(2,607)		9,665
Inventories	2,487		(2,106)
Prepaid expenses and other current assets	(3,464)		4,843
Trade accounts payable	(6,670)		(7,247)
Other current liabilities	(4,606)		(162)
Long-term assets	130		(1,553)
Long-term liabilities	(280)		(1,039)
Net cash provided by operating activities	(10,212)		15,054
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(3,691)		(6,029)
Capital expenditures for intangible assets	(46)		(44)
Sale of other investments	32
Purchase of other investments			(506)
Net cash used in investing activities	(3,705)		(6,579)
Cash flows from financing activities:
Net proceeds from issuance of common shares	5,542		2,143
(Repayment of) proceeds from bank borrowings, net			(15)
Changes in restricted cash	4,502		(8,141)
Excess income tax benefit on employee stock-based awards	29		78
Net cash provided by financing activities	10,073		(5,935)
Effect of exchange rate changes on cash	37		(433)
Net decrease in cash and cash equivalents	(3,807)		2,107
Cash and cash equivalents at the beginning of the period	28,924		30,767
Cash and cash equivalents at the end of the period	25,117		32,874
Further Restatement [Member] | Originally Reported [Member]
Cash flows from operating activities:
Net income	782		2,116
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,004		4,995
Amortization of debt costs	180		180
Amortization of exclusivity agreements	346		311
Provision for doubtful accounts	2,579		3,227
Deferred income taxes	(246)		(744)
Share-based compensation	1,461		1,943
Excess income tax benefit on employee stock-based awards	(29)		(78)
Other	166		(345)
Change in operating assets and liabilities:
Trade accounts receivable	(3,780)		13,779
Inventories	(1,690)		(4,230)
Prepaid expenses and other current assets	(2,806)		(179)
Trade accounts payable	(6,670)		(7,242)
Other current liabilities	(4,761)		4,478
Long-term assets	130		(2,014)
Long-term liabilities	(280)		(743)
Net cash provided by operating activities	(10,178)		15,454
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(3,691)		(6,029)
Capital expenditures for intangible assets	(46)		(439)
Net cash used in investing activities	(3,737)		(6,468)
Cash flows from financing activities:
Net proceeds from issuance of common shares	5,542		2,143
(Repayment of) proceeds from bank borrowings, net			(15)
Changes in restricted cash	4,502		(8,141)
Excess income tax benefit on employee stock-based awards	29		78
Net cash provided by financing activities	10,073		(5,935)
Effect of exchange rate changes on cash	103		(431)
Net decrease in cash and cash equivalents	(3,739)		2,620
Cash and cash equivalents at the beginning of the period	30,486		31,055
Cash and cash equivalents at the end of the period	26,747		33,675
Further Restatement [Member] | Restatement Adjustments [Member]
Cash flows from operating activities:
Net income			2,384
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			34
Provision for doubtful accounts			(1,853)
Deferred income taxes			738
Other			736
Change in operating assets and liabilities:
Trade accounts receivable			(5,190)
Inventories			2,130
Prepaid expenses and other current assets			2,874
Trade accounts payable			(5)
Other current liabilities			(2,408)
Long-term assets			461
Long-term liabilities			(296)
Net cash provided by operating activities			(395)
Cash flows from investing activities:
Capital expenditures for intangible assets			395
Net cash used in investing activities			395
Further Restatement [Member] | Original Restatement [Member]
Cash flows from operating activities:
Net income			4,500
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			5,029
Amortization of debt costs			180
Amortization of exclusivity agreements			311
Provision for doubtful accounts			1,374
Deferred income taxes			(6)
Share-based compensation			1,943
Excess income tax benefit on employee stock-based awards			(78)
Other			391
Change in operating assets and liabilities:
Trade accounts receivable			8,589
Inventories			(2,100)
Prepaid expenses and other current assets			2,695
Trade accounts payable			(7,247)
Other current liabilities			2,070
Long-term assets			(1,553)
Long-term liabilities			(1,039)
Net cash provided by operating activities			15,059
Cash flows from investing activities:
Capital expenditures for property, plant and equipment			(6,029)
Capital expenditures for intangible assets			(44)
Net cash used in investing activities			(6,073)
Cash flows from financing activities:
Net proceeds from issuance of common shares			2,143
(Repayment of) proceeds from bank borrowings, net			(15)
Changes in restricted cash			(8,141)
Excess income tax benefit on employee stock-based awards			78
Net cash provided by financing activities			(5,935)
Effect of exchange rate changes on cash			(431)
Net decrease in cash and cash equivalents			2,620
Cash and cash equivalents at the beginning of the period			31,055
Cash and cash equivalents at the end of the period			33,675
Further Restatement [Member] | Further Restatement Adjustments [Member]
Cash flows from operating activities:
Net income	1,726		(1,053)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	(258)		38
Provision for doubtful accounts	(2,471)		(6)
Share-based compensation	(274)
Other	(152)		30
Change in operating assets and liabilities:
Trade accounts receivable	1,173		1,076
Inventories	4,177		(6)
Prepaid expenses and other current assets	(658)		2,148
Other current liabilities	155		(2,232)
Net cash provided by operating activities	(34)		(5)
Cash flows from investing activities:
Sale of other investments	32
Purchase of other investments			(506)
Net cash used in investing activities	32		(506)
Cash flows from financing activities:
(Repayment of) proceeds from bank borrowings, net
Effect of exchange rate changes on cash	(66)		(2)
Net decrease in cash and cash equivalents	(68)		(513)
Cash and cash equivalents at the beginning of the period	(1,562)		(288)
Cash and cash equivalents at the end of the period	$ (1,630)		$ (801)

[1] Unaudited