THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Short-term investments, Restricted cash, Concentration of credit risk (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Concentration of credit risk
Cash and cash equivalents, as reported on the balance sheets	$ 62,473,000	$ 56,780,000	$ 263,199,000
Long-term restricted cash	8,025,000	0	0
Cash, cash equivalents, and restricted cash, as reported in the statements of cash flows	70,498,000	56,780,000	263,199,000	$ 54,930,000
Impairment of long-lived assets	$ 12,019,000	$ 0	$ 3,189,000
Customer Concentration Risk \| Net sales revenue \| HPE
Concentration of credit risk
Concentration risk	13.00%	16.00%	14.00%
Customer Concentration Risk \| Net sales revenue \| Dell
Concentration of credit risk
Concentration risk	11.00%
Customer Concentration Risk \| Accounts receivable \| HPE
Concentration of credit risk
Concentration risk	13.00%	11.00%

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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